Mechanism for forming latch pivots



July 5, 1932. H. w. KRANZ MECHANISM FOR FORMING LATCH PIVOTS Z-Sheets-Sheet 1 Filed Nov. 4, 1929 hunnnnnhnnnn JNVENTOR fie/12y 1W. Afravg;

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MECHANISM FOR FORMING LATCH PIVOTS Filed Nov. 4, 1929 2 Sheets-Sheet 2 ZZIIIIIIII mnumungnuw 1 2 INVENTOR.

3 E i fia yW/ffayz O 3 L 45* ATTORNEYJ? Patented July 5, 1932 UNITED, STATES HARRY w. KRANZ, or LAKEWOOD, OHIO, COMPANY, or CLEVELAND, OHIO, A CORPORATION or OHIO PATENT joFFlcn ASSIGNOR .TO EDI-IE CLEVELAND WELDING MECHANISM non. FORMING LATCH rrvoms Application filed November The subject of this invention is a mechanism for forming latch pivots of the type em-- ployed in the rim-locking device disclosed in my copending application, Serial No. 214,878, filed August 23, 1927. An object of this invention is to provide mechanism which will form such latch pivots in the form described by a simple operation consisting of but related steps.

iso

closed means constituting however, but one.

of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings:

Fig. 1 is a plan view of the apparatus embodying the principles of my invention; Fig. 2 is a vertical section view of the apparatus disclosed in Fig. 1 on the line 2-2; Fig. 3 is a section view of the apparatus in Fig. 1 on the line 3-3;. Fig. 4 is an isometric projection of the latch clamp and pin holder; Fig. 5 is an elevation view. of one type of latch embodying the latch pivot member; Fig. 6

- is an elevation view of such latch pivot member before undergoing the operation carried out by the mechanism of my present invention; Fig. 7 is a side elevation view'of Fig. 6; Fig. 8 is a front elevation of the latch pivot member after the completion of the shearing operation; and Fig. 9 is a side elevation of Fig. 8.

Referring more specifically to the drawings and especially to Fig. 3, the latch member 10, withlatch pivot member 11 contained therein, is inserted in the mechanism by placing said latch member upon the supports 12 and 13 provided therefor. The support 13 has connected therewith a pin-holding element 14, shown in Fig. 4. Said pin-holding 4, 1929. Serial No. 404,538.

element 14 has projecting therefrom .a flange 15, said flange 15 having contained therein a .threaded hole 1:6 forreceiving aligning pin 17 shown in Fig.1, said aligning pin 17 projecting from flange 15 engages the latch member 10 in the hole 18, thereby securing said latch member 10 in proper position.

The portion of the latch member 10 con- 7 ti'guous to latch'pivot member 11, is supported upon and held inposition by the die 19, said die 19 having-die insertstrips 20 contained in the side thereof immediately contiguous to the end 21 of the latch pivot member 11. Said die 19 is held :in :proper position by base plate 22, said base plate 22 niovably supporting sliding element 23. "Slidingelement 23 is held in position with respect to base plate 22 by means ofthejifb .24. Means for adjusting said sliding element v23 within the base plate 22 are provided iby jibs 25 and 26v held in proper position by :bolts 27 as clearly shown in Fig. 1. Said sliding element 23 and base plate 22 'have formed therein suitable openings .to receive the ends of arms 28, the arms 28138111,; integrally united with holder 29, said holder beingxmovably held inthe proper form of machine (not shown); The openings formed iinxt'he sliding element 23 have rollers and 31 united along their lateral edges. Arms 28 to the movable holder-29 have formed therewith, or preferably connected thereto,

cams 32 and 33. The objectoif such cams 32 and 33 is to impart reci procable' motion'to sliding element 123 by contact with rollers 30 and. 31; respectively 'when said arms '28'attached 'to'holder 29 are caused to reciprocate in a substantially vertical direction.

The-cam 32stri'king against the roller 30 during the downward stroke of the arm 28, foroes said sliding means 23 toward-the center of the mechanism. Whenarm 28 ispul led upwardly from its position shown in Fig. '2, the cam 33will strike against the roller '31 and consequently force the sliding-means 23 to its outermost position; The openings formed in the base :plate have attachedithereto at their outer edges wearing elements 34 which bear against upstroke 'cam' :33 while arm 28 is forcing said slidingmeans '23 iniwardlyntoward the center of the mechanism,

said wearing elements 34 being preferably made of hard steel and are replaceable to more effectively keep in alignment the various elements of the mechanism. The base plate 22 has attached thereto, end plates 35 by means of bolts 36, said end plate having an opening 37 formed therein to receive springholding stud 38. Fitted to the stud 88 is a spring39 contained thereon by means of nut 41, said spring materially assisting in re turning the sliding means 23 to its outermost position after the completion of the down-.

means 23, contact-with and shear off the desired portion of the .end 21 oflatch pivot member 11. These punches 40 are preferably four in number so that the entire operation of reducing the ends 21 of latch pivot mem ber 11 may be accomplished by one downward stroke of the holder 29 and arms 28. Attached to the holder 29 and downwardly extending therefrom at a point immediately above said die 19 isa stud 43, said stud 43 being. held in the holder 29 by means of a bushing 44. Between said bushing-44 and the head: 45 of said stud 43 is interposed a spring 45, the purpose of which is to keep said head 45 of the stud 43 resting upon latch member 10, as shown in Fig. 8, during the shearing operation.- Said stud 43 has attached thereto at its upper end 46, a holder 47 which contacts .with the end 48 of the bushing 44 and prevents said stud 43 from being forced completely outof said holder by the spring 45. It will be seen from an examination of the above described mechanism that the ends 21 of the latch pivot members 11 may be formed ,to correspond to the form shown in'Figs. 8 and 9 by a single operation. It will be further noted that the mechanism provides for positive operation of all of its details during every step in said forming process.

I -Other modes of applying the principie of my invention may be employed instead of the one explained, change being madeas regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:

1., In a latch pivot forming mechanism of the character described, work holding means comprising a vertical fiange'and alateral pro ect1on on said flange adapted-to extend through an opening in said latch and maintain the latter in alignment during the forming operation.

2. In a latch pivot forming mechanism of the character described, work holding means comprising a vertical flange and a pin mounted in said flange and extending perpendicularly from the lateral face thereof, said pin being adapted to extend through a hole in said latch and maintain the latter in alignment during the forming operation.

3. In a latch pivot forming mechanism of the character described, the combination of a spring mounted vertical plunger for contacting with the upper edge of the latch, horizontally reciprocal punches for forming the pivot, and work holding means comprising a vertical flange and a lateral projection on said flange adapted to extend through an opening in said latch and maintain the latter in alignment during the forming operation.

4. In a latch pivot forming mechanism of the character described, the combination of a spring mounted vertical plunger for contacting with the upper edge of the latch, horizonta ly reciprocal, punches for forming the pivot, and work holding means comprising a vertical flange and a pin mounted in said flange and extending perpendicularly from the lateral face thereof, said pin being adapted to extend through a hole in said latch and maintain the latter in alignment during the forming operation.

Signed by me this 1st day of November, 1929.

. HARRY l/V. KRANZ. 

